Board Thread:Pokémon Help/@comment-31398341-20170703145512/@comment-31398341-20180216043130

Hayds126 wrote: I remember hearing recently that ambipom went from NU to UU in smogon. Idk if it’s due to it getting tail slap with skill link in usum(making it a superior cinccino sort of).

It’s that or suddenly people thought ambipom is better than it really is and it’s sudden rise in usage is temporary. It's just because of Pokeaim. Actually it is barely viable outside of being a revenge killer to Serperior and access to wide range of tutor moves, which is still bad.